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True.
False. The sort method of the Collections class can be used without a Comparator object to sort a list into ascending order according to the natural ordering of its elements.
False. The sort method of the Collections class is a static method.
False. The Collections class provides a large number of very interesting and useful methods, such as sort , binarySearch , copy , reverse , and reverseOrder . The Collections class does not provide a method named ternarySearch .
True.
True.
False. Collection is an interface and Collections is a class.
True.
Tom TOM Joe JOE Bill BILL
| Listing 1 . Comparator06.java . |
|---|
//File Comparator06.java
//Copyright 2001, R.G.Baldwinimport java.util.*;
import java.io.Serializable;public class Comparator06{
public static void main(String args[]){
new Worker().doIt();}//end main()
}//end class Comparator06class Worker{
public void doIt(){Iterator iter;
Collection ref;ref = new LinkedList();
Populator.fillIt(ref);Collections.sort((List)ref, new TheComparator());
iter = ref.iterator();while(iter.hasNext()){
System.out.print(iter.next() + " ");}//end while loop
System.out.println();}//end doIt()
}// end class Workerclass Populator{
public static void fillIt(Collection ref){ref.add("Joe");
ref.add("Bill");ref.add("Tom");
ref.add("JOE");ref.add("BILL");
ref.add("TOM");}//end fillIt()
}//end class Populatorclass TheComparator implements Comparator,Serializable{
public int compare(Object o1,Object o2){if(!(o1 instanceof String))
throw new ClassCastException();if(!(o2 instanceof String))
throw new ClassCastException();//Do an upper-case comparison
int result = ((String)o1).compareTo(((String)o2));return result*(-1);
}//end compare()}//end class TheComparator |
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.
I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.
Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.
-end-
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